Penetrating oil and lubricant



Patented Apr. 13, 1926.

UNITED STATES HOWARD NORMAN OOPTHOBNE, OF WINNE'IIKA, ILLINOIS, ASSIGNOR TO ILLINOIS GRAPHITE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PENETRA'IING OIL AND LUBRICANT.

No Drawing. Application filed June 5,

7 all whom it may concern:

Be it known that I, HOWARD NORMAN Cor- THORNE, a citizen of the United States of America, and a resident of \Vinnetka, coun- 5 ty of Cook, and State of Illinois, have-invented anew and useful Improvement in Penetrating Oils and Lubricants, of which the following is a specification.

The main object of this invention is to pro vide'an oil of high penetrating power to act as a lubricant and vehicle to carry cushion lubricating matter between coacting surfaces having very slight relative motion, and where said coacting surfaces have a spacing varying from .001th of an inch-to zero; to provide a light oil of low evaporating rate which will hold deflocculated graphite in suspension indefinitely and even permit the graphite to pass through filter paper without precipitation, and further to. act as a vehicle to carry by capillary attraction the graphite between the leaves of automobile sprin When defiocculated graphite is suspended in hydro carbon oils of low viscosity. the lubricating value is greater and more lasting in its efi'ects than when the same form of graphite is mixed with the ordinary viscous lubricating oils.

Practical road tests on fthe chassis of an automobile and particularly on the bodysupporting 3 rings, together with laboratory tests with fi ter paper, show that the light naphtha oils in common use as a vehicle for graphite only penetrate a comparatively short distance before the oil leaves a deposit or graphite cushion, which acts as a dam, preventing further penetrating action. Uncoupling of springs which have been treated 'with the usual lubricating oils shows that 40 the oil has penetrated on an average about of an inch on each edge of the spring, leaving the center of approximately 1 inches without any lubricant. My discovery com- 19 prises the use as a vehicle of a penetrating 1924.; Serial No. 718,061.

oil having a very low. evaporating rate, which oil carries with it the deflocculated graphite-into the smaller spaces. hicle of itself has a substantial lubricating value. This vehicle is obtained by the redistillation of pentadecane, O d-H or oil of the parafiin group known as heavy lubricating' oils. In the process of re-distillation there is separated or cracked from such lubricating oil a distillate having a specific gravity of approximately .843 at 60F. at a distilling range from 220 C. to 350 C. This distillate has the physical appearance and some of the characteristics of pentane C,,+H butevaporates slowly. This distillate when mixed with powdered or defloc culated graphite has toa remarkable degree the ability to hold the graphite in a finely divided state for an indefinite period. The oil appears to have almost no viscosity, hence its great penetrating power. When this distillate is subjected to re-distillation both the The vere-distillate and the residue are failures'in performing the function of a penetrating. oil acting as a carrier for graphite. The new distillate obtained by distilling the penetrating oil is a failure because it evaporates like the light naphtha oils, and the residue because it has the non-penetrating characteristics of the viscous oils. When prepared as a commercial product it is more pleasant to handle when there is incorporated in the mixture amyl acetate, oil of citronella, or essential oils as an odorizor.

I claim:

.A lubricant comprising deflocculated specific gravity of approximately .843 at 60 degrees F. obtained by cracking pentadecane at a distilling range of 220 degrees C. to 350 degrees C.

Signed at Chicago this 4th day of April, 24. HOWARD NORMAN COPTHORNE.

graphite suspended in a distillate having a 

